partial support for Array.map/filter

git-svn-id: http://haxe.googlecode.com/svn/trunk@5877 f16182fa-f095-11de-8f43-4547254af6c6
use default expression's position if available

git-svn-id: http://haxe.googlecode.com/svn/trunk@5878 f16182fa-f095-11de-8f43-4547254af6c6